Magma blocks are found naturally in the Nether, around the level of the lava sea, between Y=23 and Y=37. They generate in large veins of similar size to dirt and a similar frequency to blocks like andesite in the Overworld, generating 4 veins per chunk.

In the Overworld, magma blocks generate at the bottom of ocean ravines.

Magma blocks damage living entities standing on top of them even if underwater (with exceptions such as shulkers or guardians), dealing 1 () of damage every tick (although damage immunity reduces this to once every half-second). Magma blocks do not destroy items. Damage taken is considered fire damage and is reduced by armor, shields, the Resistance potion effects, and the Protection and Fire Protection enchantments. Armor will take damage, but a shield will not. The player can avoid being damaged at all, either by sneaking, using a potion of fire resistance, or by wearing Frost Walker boots.

Blocks that are the height of a trapdoor or lower (such as snow layers, carpet, repeaters or comparators) will not prevent a magma block from damaging mobs and players above it.

Magma blocks have a few specific death messages. If a player or named pet is killed simply from standing on the block, the death message displayed in chat is: "[player] discovered the floor was lava". If a player or named pet was pushed to their death onto magma blocks, the message is: "[player] walked into danger zone due to [player/mob]".

When a water source is directly above a magma block, a bubble column will be created in the water, dragging down entities that get into it. The bubble column will continue up in the water, until there are no more water sources above.

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